Effect of small boron additions to steel A small percentage of boron is added to steels primarily to achieve which effect? Choose the correct option.
Mechanical Engineering
Engineering Materials
Difficulty: Easy
Choose an option
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AIncrease hardenability
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BReduce machinability
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CIncrease wear resistance
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DIncrease endurance strength
Answer
Correct Answer: Increase hardenability
Explanation
ConceptMinute additions of boron (on the order of tens of ppm) markedly increase hardenability by reducing the tendency for ferrite/pearlite to form at prior austenite grain boundaries, allowing deeper martensitic transformation on quenching.
Final AnswerIncrease hardenability